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application noteS For uSing S4QD reFrigerant
legenD
Shaded boxes indicate flooded conditions.
Rated design values. The suction pressure
will be lower than design value if outdoor air
flow, entering dry bulb, or entering wet bulb
temperatures are lower than design.
• this equipment's cooling system contains refrigerant under high pressure. always use safe and
environmentally sound methods when handling refrigerant handling or servicing the unit. review the
factory literature and safety warnings prior to servicing.
• When repairing system leaks, always use a nitrogen (inert) gas to protect the refrigerant system and pressure
check the repair before re-charging. Always replace the filter-dryers when performing any repair to the refrigeration
system with one capable of acid removal. After completing the repairs, evacuate the system to 350 - 500 microns
and weigh in the refrigerant to the amount specified on the unit rating label.
• The refrigerant charging charts and tables are valid for a variety of indoor, return air conditions and are most
influenced by the outdoor ambient temperature, outdoor fan operation and the unit operating voltage. Before using
these tables and charts, make sure the unit is in a stable operating mode. As shown in Tables 4 - 7 (pages 8 & 9)
and Figures 2 - 7 (pages 10 - 12), the ideal system sub-cooling can vary over the range of operation. Reference
the tables to determine the ideal amount of sub-cooling for a given liquid pressure. Units charged to other values
will not perform at the rated unit efficiency (EER) or rated Coefficient of Performance (COP) in heating mode.
• To inspect a systems operation using quality instruments, match the measured liquid temperature to the units
table. The measured liquid pressure reading should be within 3% of the table value for most installations.
• For systems that are operating with more than a 5% deviation, inspect the unit for the proper voltage and phase
balance and the refrigeration system for leaks.
• Units that are operating at less then 95% of the nominal voltage or with a 2% phase imbalance may see a more
significant deviation than the amount stated above.
• Do not use the tables in systems that have a fan cycling under low-ambient control. Refer to the low-ambient
kit instructions for more information. (If applicable)
Suct.
70
press.
liq.
Dis.
liq.
press.
temp.
press.
126
257
136
128
258
139
280
130
259
143
281
132
266
146
282
134
270
150
288
136
291
138
140
142
144
146
148
150
152
table 4. charging table for S4QD-024Kc Series (2 ton units) - orifice matches
8
cHarging cHartS & tableS - cooling only
outDoor temperature (° F)
75
80
Dis.
liq.
Dis.
liq.
temp.
press.
temp.
press.
139
143
304
143
146
305
146
327
150
306
149
328
153
310
153
329
313
156
332
335
337
noteS:
1. All pressures are listed psig and all temperatures in °F
2. Discharge temperatures GREATER than charted values
indicate an UNDERCHARGED system.
3. Discharge temperatures LESS than charted values
indicate an OVERCHARGED system.
85
90
Dis.
liq.
Dis.
liq.
temp.
press.
temp.
press.
146
149
351
150
153
352
153
374
156
353
156
375
160
355
160
376
163
357
163
378
359
166
380
381
95
100
Dis.
liq.
Dis.
liq.
temp.
press.
temp.
press.
153
156
397
157
160
399
160
421
400
163
422
163
166
401
166
423
170
402
170
424
404
173
425
426
105
Dis.
temp.
160
163
167
170
173
176
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